a)
[tex]35 \times {10}^{6} = 3.5 \times {10}^{7} [/tex]
b)
[tex]0.9 \times 10 {}^{8} = 9 \times {10}^{7} [/tex]
c)
[tex]657000 = 6.57 \times {10}^{5} [/tex]
d)
[tex]0.0009 = 9 \times {10}^{ - 3} [/tex]
